Battery terminal



H. R. MITCHELL.

BATTERY TERMINAL.

APPLICATION FILED MAY 29' I922.

Patented Dec. 12, 1922.

3 ywanf 01,

Harry B-ML tche ii Patented Dee.

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HARRY B. MITCHELL, 0E SEATTLE, WAFEHINGTON, ASSIGNOR TO MITCHELLPRODUCTS comranr, on sna'rrtn, vvnsnrNc'roN, A CORPORATION orWASHINGTON.

nnr'rnar TERMINAL.

Application filed. may ca, 1922. Serial No. 564,398.

To all whom it may concern:

Be it known that T, H R. MITCHELL, a citizen of the United States ofAmerica, and resident of the city of Seattle, in the county of King andState of Washington, have invented certain new and useful limprovementsin Battery Terminals, of which the following is a specification.

My invention relates to storage battery terminals and has for itsprincipal object the provision of means whereby raveling out of theinsulation adjacent the end of the tapered plug may be largelyprevented, and if raveling out should begin, to protect thls end of theinsulation against further ravelly invention comprises those novel partsand combinations thereof which are shown in the accompanying drawings,described in the specificatlon and particularly defined by the claimterminating the same.

In the accompanying drawings T have shown my invention in the form whichis now preferred by me.

Figure 1 is a section through the complete assembled battery terminal.

Figure 2 is an elevation of the same arts, shown disamembled, one partbelng s own in section.

Figure 3 is a part section and part elevation through an end of the wireconductor and the plug and sleeve connected thereto Connectors employinga ring 3 which is adapted to be suitably secured to the post of astorage cattery and having a tapered socket 30for the reception of atapered plug 2 are common in the art. This portion of the terminal formsno part of my invention, and while I have shown it to illustrate theapplication of my invention, it will be apparent that any suitable formof connector may be employed. Such terminals commonly employ a screw 31threading within a bore 21 in the end of the plug 2 to draw the taperedplug into the socket 30 and thus to form a tight electrical connectionbetween the plug and its circuit; this likewise forms no part of myinvention.

In such terminals a wire conductor 4, covered with 'a sheet ofinsulation 40, is secured within a bore 22 at the opposite end of theplug 2 from the bore 21. The insulation 40 is cut away from the end ofthe conductor 4 and its end lies adjacent the end of the plug 2 whichcontains the bore 22. Qrdlnarily where this end of the insulation 1sleft unprotected it will in a. short time ravel out and leave theconductor exposed.

its socket 30, and this end is threaded as shown at 23. Upon thisthreaded end is secured a sleeve 1 threaded as indicated at 12. Ifdesired other suitable means of securing the sleeve 1 upon the plug 2may be employed, although the arrangement shown is simple andinexpensive. The free end of the sleeve 1 extends beyond the threadedend of the plug 2 and beyond the end of the insulation 40 which isadjacent thereto. Preferably the sleeve does not touch the insulationnormally. Its end may be flanged inward as indicated at 11 to lie moreclosely adjacent the insulation 40 and to prevent its withdrawal fromthe insulated conductor, but preferably this flanged end still does nottouch the insulation when the conductor is in axial alinement with theplug 2. A chamber 10 is thus formed between the sleeve 1, its flange 11,and the end of the plug 2.

In the chamber 10 lies the end of the insulation 40 with nothing totouch it or to disturb it or to draw it away from the end of the plug 2.The conductor 4 is free to bend somewhat as is shown in Figure 3 and yetthere is no contact between the insulation and the sleeve such as wouldtend to withdraw the insulation from. the conductor or from the end ofthe plug 2. Thus, unless the sleeve is withdrawn from the threads 23 asis shown inFigu're 2, the insulation can not be disturbed and will notravel. Mere withdrawal of the sleeve will not affect the insulation asthe two do not touch, but if the sleeve is left unattached to the plug2, or if it is repeatedly withdrawn therefrom, careless handling of theconductor may cause raveling of its insulation 40. If the insulation hasbegun to ravel, as has been indicated in Figure 3, the ravelings will with the connector. A porti0n-l3 of its --"merely tend fill the ohember Tend will not ordinarily extend outside of thischam ber, particularly asthe flange ll. lies dose to theqinsulation. To prevent the sleeve coming0d of the threads 23, its end adjacent the socket" 30 maybe screwedlupto contact outer surface may be formed. of a shape to ture. a'sj'a'bovedescribed is that the sleeve ebe enlgaged b a wrench for. this purpose.

"T'Another a vantage inherent in the struc- ,1 may bejutiliz ed as ameans for'dislodgin the plug from the connector when'desire It is awellknown fact that after the plugs have been wedged forcibly into the,sockets by'screWs 31 it is difiicult to dislo e them.

It is often the: -ease-that a battery is badly damaged because theperson seeking .todisconnectatermina-l hammers uponthe headof screw 31after slightly loosening "it. Usually this results in driving the'plugout of the socket but sometimes it breaks the whole connector ofiE- andnearlyalw-ays-results in battering up the'head of the. screw.

With thisconnector-itis only necessary to loosen screw 31 and'screwupsleeve 1 against the rear end of the 'oonneotor to loosenthe. plug bythe powerful drawing action ot the at its reeri end, edrawing elementthreatled fi-thereinto'fiw engaging one end of the connectorto'drawsaid. u

in, a sleeve threaded upon said externally g-to'a seatingtherethreaded-portion of the element and extend- I in beyond the nearend thereof and an in- -su ated conductor having a bare, end engaged(with thejsoeketed endof the element that portion of the conductoradjacent the rear end of the element being received and housed threadsupon 1 the element extending far enough therealong to permit-of theforward end of the sleeve being screwed into engagein theextendingfporthn of the sleeve, "the I .'--ment with the rear end of,the socketed connecton; 1 v v Signed at Seattle ton, this l7thday ofMay, 1922. v

- HARRY a; MITCHELL.

, King Gounty,-Washing- I

